Phosphorus
Disclaimer: Information on this page is for educational purposes. Consult a physician to interpret your test results. Health Vault helps track biomarker trends but does not replace medical advice.
What This Test Measures
Phosphorus is critical for bones, ATP, and cell membranes. Regulated by PTH, vitamin D, and kidneys.
Hyperphosphatemia is typical in CKD and linked to cardiovascular mortality.
Hypophosphatemia occurs in refeeding syndrome, alcoholism, and hyperparathyroidism.
Normal Ranges
| Group | Reference Range |
|---|---|
| Men | 2.7–4.5 mg/dL (0.87–1.45 mmol/L) |
| Women | 2.7–4.5 mg/dL |
| Children | 4.0–7.0 mg/dL |
Reference ranges may vary by laboratory and assay method.
Causes of High Levels
- Chronic kidney disease
- Hypoparathyroidism
- High phosphate intake
- Vitamin D excess
- Tumor lysis syndrome
Causes of Low Levels
- Hyperparathyroidism
- Vitamin D deficiency
- Malnutrition
- Refeeding syndrome
- Alcoholism
Test Preparation
- Fasting preferred
- Report phosphate binders if on CKD treatment
Related Biomarkers
| Biomarker | Relationship |
|---|---|
| Calcium | Calcium-phosphate product |
| Creatinine | Renal excretion |
| Vitamin D | Absorption |
FAQ
How often should I take this test?
With CKD — every 1–3 months.
What should I do if my result is abnormal?
Hyperphosphatemia in CKD — diet and phosphate binders as prescribed by nephrologist.
Last updated: June 2026